Striper for knitting machines



ISTRIPER FOR KNITTING MACHINES' Filed Jun@ 28, '1932 s sheets-shew 1ma.; mi, ma, H, MRQNSN 1 www@ STRIPER FOR KNITTING MACHINES n Filed June2s, 1932A s sheets-sheet 2 I @QL m, w36,

H. E. AARONSON 2,959,075

STRIPER FOR KNIT'IING MACHINES Filed June 28, 1932 3 Sheets-Sheet 3Har/y #7am/750m l Patented Oct. 27, i936V Pirrsirr OFFICE 2.05am YSTRIPEB EI'OB KNITI'ING MACHINES Y Aaronson, Camdcn. N. I., aligner toE. .Brinton Gompany, Philadelphia,

ration of Pennsylvania Application lime 28, 1932, Serial No. 619.758

My invention relates to a yarn changer and itY `vis an object thereof toprovide an improved yarn changer particularly adapted for horizontalstri!!- ing on a circular ribber of the dial and cylinder type, thoughit is not limited to such use. It is an object of my invention toprovide a device of this character wherein the new yarn, Vfrom a yarnfinger that has just been moved into feeding position, is caught by thedial needles and drawn into proper feeding position relative to bothsets of needles, the usual practice heretofore having been to have thenew yarn caught by the cylinder needles and drawn into feeding relation.

Another object o! the invention is to provide .15 improved means forpositioning any yarn ilnger. in feeding position with releasing meanscommon to all the fingers.

Another object of the invention is to provide an improved plating nnger.

Another object of the invention is to provide improved cutting andclamping means for the idled yarns. Y

Referring to the drawings, which are made a Y part of this applicationand in which similar ref- 55 erence characters indicate similar parts:

Fig. 1 is a plan of part of a knitting machine,

showing my improved devices in position thereon, f

Bldg. 2, an elevation of parts shown in Fig. 1', looking in thedirection of the arrow, which arrow also indicates the direction ofrotation of the cam (not shown) and the yarn feeding means about thestationaryneedle beds, Iilg.3, ahoriaontalsectiononline3'3otrlg.2illustrating details of operating means for the yarn clamp and cutter, Y

Fig. 4, a section lthrough the yarn clamping means on line (-4 of Fig.3,

Fig. 45, an elevation of my improved devices looking in the. oppositedirection'to the arrow in Fig. 1, i

Fig. 6, a section on of Pig. 5, looking inthedirection ofthe arrows.

Fig. 7, an elevation looking radially outward from the axis of themachine, and

|55 saidunitsupporting'thevarmyarniingersand Fig. 8, a dissembled viewof the'cutting andv (Cl. 6F14.)

yarn guiding means and certain controlling eiements now to be described.

The yarn fingers are indicated at I3, the lset oi' fingers being pivotedat I4 for movement in horizontalplanes and the outline of a ilnger be` 5-ing plainly shown in Fig. 6. Each nger has lateral extensions with'yarn guiding aperturesV indicated at I5 and I6 in Fig. 6 and one of theiingers, which is particularly designed for plating,

' has two sets of apertures, as indicated at I1 in 10 Fig. 5. An arm I8is secured to the unit II by a screw I9 and the various yarns 'lead froma suitable source of supply through eyes 2i! to the apertures I5 and Iiof the respective yarn ngers and 'thence to the needles or to the clamphereinafter -15 described.` Each o! the yarn ngers has a lug 2|extending behind a pin 22 on a slide 23, there being a group of suchslides each individualto a yarn linger, asbest shown in Fig. 5, theseslides being guidedn the unit II which has a. transverse pin 2lextending crosswise thereof above the slides for holding them in place.Detents 25 are pivoted at 26 and their noses 21 are adapted to engageshoulders 28 on the slides 23 for holding the slides in forward positionafter they have 25 moved a yarn iinger from the idle position shown inFig. 6 to the feeding position illustrated in Fig. 1.

Springs 2l, corresponding in number to the slides and their detents, areeach attached at one end to a lug 2l on a slide and at the other 'end toa hnokll on a detent 25 whereby they urge the detenta incounterclockwise direction, (shown in Fig. 6) and also urge thecorresponding slide tofwardtheleftinsaidilgureorinto,aposition 35 foridling the corresponding yarn finger, it being noted that the connectionbetweena slide and its finger is such that the finger is positivelyurged either toward or from a feeding position by appropriate movementoi ltsslide. At the rear of o thedetenisthereisareleasing deviceconsist- Ying oci' a block l2 pivoted at 33 which block can be engagedby shoulders Il on each of the slides 22 for releasing any detent whichis in engagement witha shoulder 28 cf a` slide that is holding 4,5 itsyarn finger in feeding position so as to release the detent of any suchslide and permit it to move its ilnger to idle position.

`Formovingtheslidestotherightinliigs.5

and 6, to bring the corresponding lingers 'into 50 -operative position.I have provided a cam plate Il, best shown lullig. 1, this cam platebeing oni-he iixed frame of the machine and being movable verticallyunder the control o1' pattern mechanhminot shown). v'Iiliis plate isprovided 55 with a cam face at 36 which moves a selected slide inward tothe position illustrated in Fig. 5 and it also has another cam face at31 which moves this slide farther inward to a point where its shoulder34 strikes the block 32, moving said block farther inward to tilt allthe detents 25 and release all the slides that may be held in theirinward positionby detents 25thereby releasing all said slides andpermitting their yarn fingers to move into idle position, the selectedslide and its yarn finger being held in feeding position by the cam faceat 38 on plate 35 until the yarn changer has passed the plate, when theselected slide and its finger are held in place by the correspondingdetent 25.

It will be noted as to the plating yarn finger that the two yarns fromthis finger will feed in plating relation to the needles whereby oneyarn appears on .one face of the fabric and the other on the other facein well known manner.

In addition to the yarn changing means, my invention includes yarncutting and clamping means, the essential elements of which constitute aunit attached to one side of the casting I0. These elements (best shownin Figs. 3 and 8) include a block 39, a plate 40, a spacer 4| and aplate 42, all secured to casting I by screws 43. I'he plate 42 at itsouter end is provided with longitudinally extending teeth indicated inFig. 4, which teeth cooperate with similar teeth on a ber block 44pivoted at 45 on anv arm 46 which is pivoted at 41 on the xed block 39and which has a lateral extension at 48 provided with a cam face. Theplate 40 at its inner end is formed into two forks 49 and 56 with anotch between them to receive an idled yarn. The arm .46 is forcedtoward clamping position by a coil spring 5| surroundingthe shaft 52 andbearing at its rear end against the part of the casting I0 in which-saidshaft is journalled.

'I'he shaft 52v is also journalled in the forward part of plate 42 andat one side of said plate carries a pair of hooks 53 whose function isto engage a yarn which is in the'notch between forks 49 and 50 and tocarry it downbetween the corrugated faces of the clampingelements as theshaft 52 rotates, in which movement Va camface at 53'- (Fig. 3) on thehook engages the cam 48 to separate the clamping members by moving thearm 46 about its pivot 41. The shaft 52 also has secured thereto a pairof shear blades 54 by means of a pin 54 (Fig. 3) passing through a slot(Fig. 8) in shaft 52said blades cooperating with a shearing edge on theplate 42 to cut off a yarn extending from the clamp to the needles. Aleaf spring 55 is secured to plate 42 by screws 56 and this spring isprovided at its forward end with forks engaging the hub of the shearblade to force thehub in a direction to maintain operative engagementbetween said blades and the cooperating xed blade.

For operating the. cutting and clamping devices above described theshaft 52 has at its inner end a pinion 51 coacting with a pinion 58 on ashaft 59 which in turn has a pinion 60 (Fig. 1) engaging a pinion 6| ona shaft 62 provided at its upper end with a star wheel 63 which isrotated step-by-step by means of an abutment 64 positioned when raisedto engage the star wheel at 'each rotation of the cani ring. .Aspring-pressed detent 66 engages recesses in the hub 'of 'the star wheelso as to position it correctly at the end of each quarter revolution.

A plate 66 is secured to the under face of the unit II by screws 61 andthis plate has depending pins 68 engaging a suitable support on the camring or a part rotating therewith, for holding the yarn changer inposition.

The position of the device on the machine is shown generally in Figs. 1and 2 wherein 69 indicates the dialof the machine carrying dial needlesand wherein 1l indicates the cylinder carrying the cylinder needles 12.

From the foregoing it will be seen that when a yarn, e. g. that shownatl a, is to be carried from idle position to the feeding position theplate 35 is brought into position for forcing the corresponding slide 23inward into position to be held by a detent 25 which can swing intoposition for engagement with the shoulder 28 of the slide at the propertime when the finger I3 has been moved clockwise to operative position.Immediately thereafter the shoulder 31 of the cam plate moves this slideslightly farther in, so as to turn block 32 on its pivot, releasingv alldetents and permitting any other slide or slides which may be in inwardposition to move outward, thereby moving their guides counterclockwiseinto idle position, the yarn of an idled guide moving approximately intoposition b and lying directly in the notch between forks 49 and 50. Thefinger which is to become operative is held in place by engagement ofcam face 38 with its slide until after it passes said face, whereuponits detent 25 holds that slide in place. Directly after the yarn changehas taken place the abutment 64 engages the star wheel 63 and throughshafts 62, 59, and 52 it moves the hook 53 and shear blade 54counterclockwise in Fig. 2, the hook moving the idled yarn from theposition of yarn b into the clamp and opening the clamp to release theend of yarn fed to the needles. The hook also lays the idled yarn acrossthe fixed shear blade on plate 42 and carries abight of the yarn downbetween 'the corrugated faces of the clamping members, the base o1' thehook having acted on cam 48 to open the clamp. Each shear blade 54 ispositioned a little back of the adjacent hook so as to' cut oft' theyarn after it is carried safely down into the clamp and the cut-olf endoi' the idled yarn will then be in the position indicated at d. Theupper hook member 49 is bent so as to secure early engagement with anidled yarn and insure its proper position and the lower fork 50 has anotch at 50 (Fig.l 8) to provide additional room for a plurality ofidleyarns which may be held by the clamp at the same time. The yarnwhich is carried into active position extends across from the clamp tothe end of the yarn nger until released by engagement of cam 53' withcam 48 and is thus carried across the plane of the dial needles andbetween such needles, whereupon it is grasped by the hook of the dialneedle immediately at the rear of the yarn'position and is drawn intoposition to be taken by the hooks of the descending cylinder needles.The opening of the clamp facilitates the withdrawal of the end of saidyarn from the clamp by the relative rotation of the needle beds and theneedle cams.

It will be obvious to those skilled in the art that variousmodifications may'be made in my device without departing from the spiritof the invention, therefore I do not limit myself to what is shown inthe drawings or described in the specification but only as indicated inthe appended claims: b

Having thus fully described my said invention.

aosacva what I claim as new and desire to secure by Letters Patent is:

1. -In a d ial and cylinder knitting machine, a yarn changer comprisinga plurality of yarn fingers pivotedV to swing in planes parallel to theplane of the dial needles and positioned above such plane, a pluralityof slides individually related at one end to said yarn fingers eachacting directly on a yarn nger, detents for holding the individual yarnngers in feeding position, means forv selective engagement with theother ends of said slides to actuate the yarn iinV gers, and meansoperated by an actuated slide for releasing the detent of any yarnfinger which is in operative position-and thereby permitting the yarnlinger to move to idle position.

2. In a dial and cylinder knitting machine, a yarn changer comprising aplurality of yarn iingers pivoted to swing'in planes parallel to theplane of the dial needles and positioned above such plane, a pluralityof slides individually related to said yarn fingers, detents for holdingthe individual yarn' fingers in feeding position,

means for actuating said slides selectively, and springs each connectedrespectively to a slide and to its detent said springs tending to movethe detent into position to hold-a slide in forward position and alsotending to retract said slide. i

3. In combination, a yarn finger. movable into either idle or feedingposition, a pattern controlled slide for actuating the yarn finger, apivoted detent for engaging the slide to hold the same in one position,and a single spring connected to the slide and the detent said springserving to move the detent into engagement with the slide and alsoserving' to retract the slide upon disengagement of the detent.

4. In a yarn' changer, a pivoted yarn finger, a tail extendingrearwardly from the finger in inclined relation to the body thereof, anactuating slide for the nger movable in a plane intersecting the axis ofthe finger, and a lug on said slide extending' into the notch betweenthe body of the finger and said tail whereby the finger may be movedpositively into or out of feeding position.

5. In a ,knitting machin a plurality of 4yarn fingers, actuating meanstherefor including parallel slides operatively engaged with individualyarn fingers, pattern controlled means for selec tively advancing theslides tomove their yarn fingers into feeding position, individualdetents for holding the slides in actuated position, a' releasingdevicecommon to said detents, means on Veach slide whereby excessadvancing movement of the slides actuates the releasing device, and

means in connection with said pattern controlled device for impartingsuch excess movementto a slide.

6. In a knitting machine, yarn changing means,

`yarn clamping means, a forked member between the yarn changing meansand the clamp positioned to receive an idled yarn between its forks, andmeans for engaging an idled yarn in such position and forcing it intosaid clamp. y

7. A device as in claim 6, said last-named means comprising a rotaryhook for engaging the yarn, and means moving with the hook for'openingthe clamp.

8. In a knitting machine, .a stack of yarn guides mounted on a commonvertical pivot, yarn clamping means in advance of said yarn fingers,

'a forked stationary member between said yarn ngers and said yarn clampfor receiving an mounted on a vertical pivot, yarn clamping means inadvance of said yarn fingers, a bifurcated statinary member between saidyarn fingers and said yarn clamp for engaging an idle yarn at an'intermediate point, a hook movable relatively to said guide member forengaging an idled yarn and moving it into the clamp, and'a cutteroperating in timed relation to said hook-for cutting oli' the idled yarnafter it ls entered in theclampl said clamp including a fixed clampingmember and a pivoted member and said hook includingA means for' movingthe pivoted member 'away from the xed member to permit' the idled yarnto enter between said members.

'10. In a knitting machine, a stack of yarn guides mountedon a verticalpivot, yarn clamping means in advance of said yarn ngers, a bifurcatedstationary member between said yarn fingers and said yarn clamp forengaging an idled yarn, a hook movable relatively to said guide memberfor engaging an idled yarn and moving it into the clamp, a shaft onwhich said hook is mounted, pattern controlled means for idling a yarnand then rotating said shaft to vcause the hook to carry the idled yarninto the clamp and cutting means for severingv the idled yarn after ithas been entered in the clamp. l

1l. In a knitting machine, yarn changing means, a yarn clamp for idleyarns comprising a fixed jaw having parallel corrugations, a pivoted:law having corrugations interiltting with those of the fixed jaw, and asupport for said movable jaw Said support being pivoted on an axisparallel to that of the Jaw.

12. A device as in claim l1, combined with 'a cam on said support, meansfor entering an idled yarn between'said jaws, and means acting on saidcam for opening the jaws in connection with the entering of an idledyarn between them.

13. A device asin claim 1l, the corrugations on I a cam on said pivotedsupport,l and'means for l engaging the cam to open the clamp.

16. In a yarn changer, a set of pivoted yarn iingers mounted on avertical axis, a tail extendingrearwardly from each finger in inclinedrelation to the body thereof, an actuating slide for the finger movablein a plane intersecting said axis, a lug on said slide extending intothe notch between the. body of the finger and said tail whereby thefinger may be moved positively into or out of feeding position, and apattern-controlled element adapted to be positioned for selectiveengagement with said slides for moving the respective yarn-lingers intooperative position.

17. In a knitting machine, yarn clamping means for an idle yarncomprising a fixed jaw, a movable jaw, a shaft extending through saidjaws', a pair of hooks at opposite sides of said shaft for engaging anidle yarn and forcing it between the clamping jaws, means movable withthe shaft for opening 4the jaws, yarn-cutting means including a pair ofblades at opposite sides of said shaft, and a fixed blade coactingtherewith.

18. A device as in claim 17, the cutting jaws being so located withreference to said hooks as to cut oif a yarn only after it has beenintroduced into the clamp.

19. In a knitting machine having a needle cylinder and a cam carrier, aset of yarn fingers, a rotary shaft, a plurality of shear bladesextending radially from said shaft. a shearing lelement fixed withreference to the cam ring said shearing element being positioned toreceive the yarns of said 'fingers' and to coact with the blades on saidshaft,

ind means on-said shaft adjacent each blade for positioning the yarnspreliminary to the cutting operation.

20. In a knitting machine, the combination with yarn clamping meanscomprising a fixed clamping jaw and an oscillatory clamping jaw coactingtherewith, of a yarn cutting means comprising a fixed shear blade. arotatable element having radial shear blades thereon. 'means rotatingwith said element for opening the clamping means as each radial shearblade approaches the fixed shear blade, and means for guiding idledyarns into said clamping and cutting means.

21. In a lmitting machine, having a needle cylinder and a cam carrier,the combination with yarn cutting means comprising a rotary shearelement having a radially extending shear blade thereon and a fixedshear blade on the cam ring, of yarn clamping means, and means rotatingwith said shear element serving to open the clamp and :nter an idledyarn therein.

22. In a knitting machine, the combination with yarn changing means. ofmeans for severing idled yyarns. and means for holding the end of anidled yarn comprising a pair of jaws, one 'of said jaws having a slotand being movable toward and from the other jaw to open and close theclamp, and a resilient member for guiding idled yarns into said clamp,the lower end of said member extending into the slot in said movable jawand bearing against a wall oi' the slot so as to resist the opening ofthe clamp.

23. A device as in claim 22, wherein the part engaging in said slot isof substantial width and is cut away adjacent the jaw to provide spacefor a plurality of idled yarns.

24. In a circular independent needle knitting machine, astationary-needle cylinder, a stationary dial, rotary cam carriers foractuating the needles in the cylinder and dial, a yarn changercomprising a plurality of yarn fingers above the plane of the dialneedles, said fingers being individually movable in planes approximatelyparallel to the plane of the dial needles from an idle position remotefrom the cylinder needle circle to an active position close to saidcircle, means below said plane for severing idled yarns and holding theends of such yarns, whereby a yarn upon its introduction to the needlesis taken first by the dial needles and is then drawn into position to betaken by the vcylinder needles, and means for engaging an idled yarnbetween its finger and the needles, said means carrying said yarn intoposition to be severed and held until again called into actionsubstantially as set forth.

25. In a knitting machine, a set of yarn fingers, yarn clamping means, aforked member for guiding an idled yarn toward said clamping means,rotary means adjacent said forked member for engaging an idled yarn tomove it into said clamping means and yarn severing means operating intimed relation to said rotary means for severing said idled yarn.

HARRY B. AARONSON.

